Operating valve for hydraulic presses



Jan, 20. l1925.

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Patented Jan. 20, i925.

@METEO STATES THOMAS B.'JONES, 0F TORONTO, ONTARIO, CANADA.

OPERATING VALVE FOR HYDRAULIC PRESSES.

Application filed September 28, 1923.

To all 'whom t may concern:

Be itknown that I, THOMAS B. JONES, a Subject of the King of GreatBritain, and resident of the city of Toronto, county of York, Provinceof Ontario, in the Dominion of Canada, have invented certain new anduseful Improvements in an Operating Valve for Hydraulic Presses, asdescribed in the following specification and illustrated in theaccompanying drawings, that form part of the same.

The principal objects of the invention are, to provide a means forautomatically vibrating the press plunger following the initialoperation, and to devise a simple valve structure which may be easilyregulated.

The principal feature of the invention consists in operating thepressure control valve to the press with an intermittent movement bymeans of a plunger hydraulically operated with a. reciprocating action,the hydraulic operation of the plunger being opposed to a resilientmedium.

In the drawings, Figure 1 vis a longitudinal sectional view of the mainpress operating valve.

Figure 2 is a longitudinal sectional view of the valve for effecting thevibratory action.

In the operation of hydraulic presses it has been the custom to operatethe control valve directly by a rotatable handle turning a threaded stemwhich engages the fluid control valve, lifting it from its seat andallowing the pressure to flow to the ram piston.

In certain classes of work it is desirable to impart a vibratory orhammering action to the rain of the press and it is to accomplish thisaction automatically that this invention has been devised.

In the construction herein shown, the main valve consists of the valvebody 1 having the inlet port 2 from the pressure fluid supply controlledby the valve 3, the stem 1 of which extends .into the discharge chamber5.

The plunger 6 operating in the discharge chamber and forming acommunicating pas'- sage to the exhaust chamber 7 is operated by theplunger 8 which is slidably arranged in the upper end of thevalve, saidplunger being held. upwardly clear of the plunger' G by an encirclingcoiled compression spring 9.

The automatic controlling .member illustrated in Figure 2 is preferablyarranged in alignment with the plunger lof the valve 1 and comprises asubstantially cylindrical Serial No. 665,404.

body 10 in which is formed a plunger cylinder 11 at the lower end. Thiscylinder is closed by a threaded gland 12 having a central cylindricalopening 13 in which the plunger rod 14 is guided. A packing washer 15encircles the plunger rod at the inner end of the gland.

The plunger rod 14 is formed with a cylindrical enlargement 16 which isa sliding fit in the cylinder 11 and against this enlargement is securedthe cupped pump washer 17 which is secured in place by a nut 18 threadedon the plunger.

The plunger rod 1a extends into a cylindrical chamber 19 in the body 10and isprovided with a cupped end 20.

A spiral compression spring 21 engages the cupped end 2O of the plungerrod 1a and this spring at the upper end is engaged bv a slidable pistonblock 22 arranged in the upper end of the chamber 19.

rIhe piston block 22 is threaded axially and in this is adjustablysecured a threaded member 23 which is preferably provided at its upperend with a roller contact 24. The roller contact is engaged by asuitable means for pressing the piston block inwardly7 against thecompression spring 21 and the means here shown is in the form of a cam25 mounted upon a pin 26 arranged in fixed relation to the body 10. Thiscam is operated in a suitable manner, either by a hand lever 27 or itmay be controlled by a ratchet mechanism. connected with the press. Aratchet device is here shown in the form of a wheel 2S having ratchetteeth 29 which are enH gaged by a ratchet dog 30 carried on the lever 31which is liivotally mounted on the pin 26.

The plunger cylinder 1l. .is provided with an opening 32 in the sidewall intermediate of its length which is connected with the pressureiiuidsupply leading to the press from the discharge chamber of the mainvalve so that the pressure fluid will enter the cylinder 11 and willoperate against the piston to force the plunger upwardlyv against thepressure of the spring 21. This action lifts the operating valve plunger8 and allows the closing of the valve 3 controlling the pressure supplyand opens the exhaust from the chamber 5 through the plunger 6. Thisaction releases the pressure -in the cylinder 11 against the piston 17and upon the pressure being thus released the spring 2l reacts andpushes the plunger lll) downward again opening the mainvalve 3. Thisaction will continue indefinitely as long as the piston block 22 is helddepressed by the cam 25 to create a pressure on the piston 17 throughthe spring 21, but when this cam is turned back, thefpressure `exertedby the cam on the member 23 through the spring 21 is released and theoperating plunger Sis then lifted from its seat opening the exhaust.

The up fard movement of the operating plunger 8 allows the valve 3toclo'se' therebyV block 22 is depressed and through the spring- 21 theplunger rod 14 isoperated to move the operating valve plunger of themain valve inwardly. This plunger in turn engages the hollow plunger 6which moves into contact with the valve stem 4 Vand -moving the valve 3olf its seatfthe fluid pressure is allowed to flow to the press.

Goncurrently in flowing to the press this pressure flows through thepipe 33 to thel 1 cylinder 11 and entering below the cup piston thepressure forces Vthe plunger rod'14 outwardly compressing thespring2l'.` The outward' movement of' the plunger 14 also lifts theoperating valve plunger from its seat and in so doing allows thepressure valve 3 vto close cuttinglolf the-supply of operating pressurefluid from the press and allowing the exhaust therefrom to pass backthrough the gexl'i'austpassagesof the" main valve and ofcourse Vreleasesthe pressure against the piston of the plunger rod 14. rEhe spring-2limmediately reacts and pushes the plunger rod 14 -inwardly again openingthe main valve 3 and the operation is repeated.

This alternating checking and releasing of the pressure to the presscreates a hammering or vibratory effect which is extremely desirable forcertain classes of' work and as long c.s the valve 3 is acted upon bythe pres'- sure applied through the spring-21 the vibratory action willcontinue.

The lever 31 may be suitably connected with the ram of the press so asto move upV and down with theV action of the ram and the ratchetarrangement described will operate to gradually turn the cam to itsposition of release.y

With such a device the ratchet action may be setto regulate the numberof strokes or vibrations of the" press at each operation by simplyturning the cam member 25 the desired distance.

The ratchet mechanism herein shown is very simple or it'inaybe replacedby other mechanism which will gradually releaserthe downwardV pressureoirtlie spring 21.

A device such as described is extremely simple, it can be'regulated ltosuit any desirable'condition of pressure and speed and will greatlyenhance Vthe operative l'f'unctions of a hydraulic press.

The pressure of the fluid supply to the Vpress may be regulated veryaccurately and quickly .by theV adjustment ofthe member carrying theroller 23 in the piston block-22 which thus regulates the pressure ofthe spring 21 and consequentlyregulates the 1 movement of the main valve3 from its seat What I claim as my `inventioii isfl. In a` hydraulicvalve, apressure fluid control valve, a plunger4 for operatinglsaidvalve, a resilient plunger operatively engaging said valve operatingplunger, and hydraulic means 'for opera-tingusaidv resilient plunger. V

2. In a hydraulic valve, a pressure fluid control valve having anoperating plunger, a

plunger operatively 'connected with the aforesaidplunger, a cylinderenclosingsaid latter plunger, means for conducting pres- Y sure fluid tosaid cylinder to operate the plunger therein in o-ne direction,` and-"resilient means opposing the operation of'said latter plunger.

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3.v In a hydraulic-valve, ay pressure fluid control valve havinganoperating plunger,` a plunger operatively connectedwith the aforesaidplunger, a cylinder enclosing said latter plunger, means for. conductingpres? sure liuidto said cylinder to operatethe plunger therein inionedirection, and'adjust-k able resilient means' opposing the"operatioriv vY Y 11o 4. In a hydraulic valve, av pressure fluid of said latterplunger.

control valve having an'op'erating plunger,Y a plunger' operatively'coiiii'ectedl` with' the44 aforesaid plunger, a cylinder enclosingisaidlatter plunger, means for coiiductingpressure fluid to said cylindertooperate the plunger therein in one direction, resilient" meansopposing the operation' of said plun'gl` er, andmeans adapted toincreasel or decrease the resistance of "said resilient meanstotheaction of the said 'latter plunger.

5. In a hydraulic valve, a pressure fluid control'v valve having anoperatingpli'inger, a plunger operatively connectedfwi'th the aforesaidplunger, a cylinder enclosing said latter plunger, means for conductingpressure fluid to said cylinder to operatethe plunger thereinv in onedirection, resilient means opposing the operation of said'latt'erplunger, a slidable member engaging said resilient means', and means foroperating said slidable member to regulate the resistance of saidslidable member to the hydraulic movement of said latter plunger.

6. In a hydraulic valve, a pressure fluid control valve having anoperating plunger, a plunger operatively connected With the aforesaidplunger, a cylinder enclosing said latter plunger, means for conductingpressure fluid to said cylinder to operate the plunger therein in onedirection, a spiral compression spring engaging said hydraulic plunger,and an adjustable member engaging the outer end of said spring.

7. In a hydraulic valve, a pressure fluid control valve having anoperating plunger, a plunger operatively connected With the aforesaidplunger, a cylinder enclosing said latter plunger, means for conductingpressure fluid tosaid cylinder to operate the plunger therein in onedirection, a spiral compression spring engaging said hydraulic plunger,an adjustable member engaging the outer end of said spring, and a camengaging said adjustable member.

8. In a hydraulic valve, a. pressure fluid control valve having aplunger, a plunger operatively connected with the aforesaid plunger, acylinder enclosing said latter plunger, means for conduct-ing pressurefluid to said cylinder to operate the plunger therein in one direction,a spiral compression spring engaging said hydraulic plunger, anadjustable member engaging the outer end of said spring, means foroperating said adjustable member, and means actuated by the press forautomatically moving said operating means to gradually reduce theresistance of the spring to the hydraulic movement of said hydraulicplunger.

9. In a hydraulic valve, a pressure fluid control valve having anoperating plunger, a plunger operatively connected with said main valve,a cylinder enclosing said latter plunger, means for conducting pressurefluid to said cylinder to operate the plunger therein in one direction,resilient means opposing the operation of said plunger, and means forregulating the flow of the pressure fluid to said cylinder.

10. In a valve for hydraulic presses, a pressure fluid control valvehaving an operating plunger and discharge and eX- haust chambersconnected With the press, a conduit leading from the discharge chamber,a cylinder connected With said conduit, a piston operating in saidcylinder, a plunger connected With said piston and operatively connectedwith said operating plunger, and resilient means engaging said plungerpiston to operate it to open the main valve.

l1. In a valve for hydraulic presses, a pressure fluid co-ntrol valvehaving an operating plunger and discharge and exhaust chambers connectedWith the press, a conduit leading from the discharge chamber, a cylinderconnected With said conduit, a piston operating in said cylinder, aplunger connected with said piston and with said operating plunger,resilient means engaging said plunger piston to operate it to open themain valve, and a stop valve arranged in said conduit to regulate theflow of the pressure fluid to the plunger cylinder.

12. In a valve for hydraulic presses, a fluid pressure control valvehaving a reciprocating operating plunger, a cylinder arranged inalignment with said operating plunger, a piston operating in saidcylinder and connected With said plunger, a cylindrical chamber inalignment with said cylinder, a coil compression spring arranged Withinsaid chamber and engaging the pis ton of said plunger, a piston blockslidably arranged in the outer end of said cylindrical chamber andengaging said spring, a member threaded in said piston block, and means`engaging said threaded member for operating said piston block in saidchamber.

THOMAS B. JONES.

